Driving mechanism for winders for artificial silk



March 6, 1928. 1,661,990

H. BENIT DRIVING MECHANISM FOR WINDERS FOR ARTIFICIAL SILK Filed July 19. 1926 A I mug- 222 014 154. 721! fi zzzf Patented Mar. 6, 1928.

UNITED STATES HENRI BENI'I', O1 PARIS, MOE.

DRIVING MECHANISM FOR WINDERS FOB ARTIFICIAL SILK.

Application filed July 19, 1926, Serial No.

The difliculties which occur in driving electrically various apparatus used in the manufacture of artificial silk are well known.

The individual control of the centrifugal machines in particular has been effected even quite recently by means of mechanical transmission devices such as toothed gearing, belts etc., which do not permit of obtaining with ease the very high speeds which are necessary in this industry and even when a direct drive is employed, the electrical motors or the essential parts thereof are very rapidly put out of order.

"With these considerations in view, a solution has been offered, which without doubt permits spinning boxes to function, but these proposals are too complicated for reliable operation and are further expensive because of the complications which they involve.

It is known that spinning boxes or centrifugal machines into which the thread or artificial silk falls rest on a shaft of appropriate form to which the rotor of an electric motor is directly keyed. The centrifugal machines rotate at a speed of 5000 to 6000 revolutions per minute, and it is therefore indispensable that this shaft, considering its unsupported outer end on one hand and the mass of the spinning box on the other hand, should not be subjected to, any deviation about its axis, and if such a deviation should occur that the shaft should automatically centre itself and take its normal position. The difliculty of'the problem may thus be realized, especially if it is further considered that it is not possible to make perfectly balanced spinning boxes or pots.

The present invention has for its object driving means including two concentric shafts of which the outer drives b friction the inner one carrying the centr i ugal ma-' 123,532, and in Germany February 1, 1988.

rests the upper housing 3. The inner circular face of the lower housing 4 serves to support the motor. It is this housing which is adapted for the support of the whole as hereinafter explained.

(b) A rotor of an asynchronous cage motor (the particular casev considered being a winder). The discs 5 are forced over a main hollow shaft 6. On the upper part of this main shaft is fixed the box 7 in which is mounted the outer cage of a ball bearing 8, the inner cage being slidably mounted on the sleeve 9 of the upper housin 3 in order to permit expansion of the sha when the motor attains its normal working temperature. To the lower part of this main shaft is secured a thrust ball bearing 10. This bearing supports the weight of the movable assembly.

Within the main shaft 6 is provided a second shaft 11 which is flexible. This inner shaft 11 contacts with the main. shaft 6 through the medium of two collars having external spherical surfaces 1212'. These two collars contact with the main shaft in the axes of the ball bearings 8 and 10. The part between the collars is of reduced diameter so that it is rendered flexible and can consequently become deformed without danger. 1

The upper part of this flexible shaft extending beyond the main shaft 6 is of greater diameter to provide greater rigidity. This end of the inner shaft 11 is coupled to the device to be driven, in the present case, the spinnin box 18.

The rotation o the main shaft 6. is transmitted to the inner shaft 11 by the pressure on the ends of the main shaft of a washer 13 and of a cap 14 slidable on the inner shaft 11.

The centre of the radius of curvature of the cap let and of the end of the main shaft 6 is located at the intersection of the axis of the upper collar 12 with the axis of the flexible shaft 11.

I Thekyontact pressure is regulated by means of a spring 15 through the medium of a nut 16 which is looked after regulation of the pressure, in order to avoid loosenin of pprts. The assembly is protected by a 00d 1 This arrangement of concentric shafts allows of thevemployment of high speeds of rotation. The flexible shaft centres itself automatically, the deformation being rendered ossible by the reduction of the diameter o the shaft between the collars. The

cap 14 at the upper part of the shaft acts in the manner of a shock absorber, com- 6 pleting the elastic system.

Ill the inner flexible shaft has a conical end on which the winding box is placed.

It will be understood that the invention is not limited to 'the' example which has been illustrated and described and that the w system of driving a body by means of two concentric shafts as described above is to be regarded as lying within the scope of the invention.

tical axis in which the outer end of the shaft extends considerably beyond the outer bearin 1 Havln this fully described the invention, what I c aim as new and desire to protect by Letters Patent is:

A. driving system of the character described comprising an outer and an inner shaft, means for driving said outer shaft, collars formed on said inner shaft and engaging the outer shaft, said inner shaft being reduced-in diameter and rendered flexible between said collars whereby the inner shaft is centred automatically at high'speed, a housing enclosing the said shafts, and ball bearings between the said outer shaft and holillsing and disposed in the axes of said co ars.

The present arrangement for driving the 20 inner shaft b friction may be employed in all high spec electric motors having a verlln witness whereof I have hereunto set my 40 hand,

- HENRI BENIT. 

